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Article
Upgrading Two Dimensional Search Radar to Three Dimensional Search Radar Based on SDR
تطویر رادار الكشف ثنائي الأبعاد إلى رادار كشف ثلاثي الأبعاد باستخدام ( SDR )

Author: H.T. Ziboon
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2010 Volume: 28 Issue: 18 Pages: 5757-5770
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper presents an exploitation of the existing two dimensional radars(2D) which have two identical antennas for reception to be upgraded to a threedimensional radar (3D) in order to measure the height as well as the slant rangeand azimuth direction. The height measurement is important for preliminaryinformation for reducing the time required for acquisition. Software DefinedRadio (SDR) is chosen for the implementation of height finder processor is givenin this paper. Design parameters are selected for the proposed height finderprocessor in order to accommodate SDR requirement. This work is also concernedwith the analysis of the parameters which affect the accuracy of height finding.These parameters include the refraction index, smooth surface reflection,divergence and rough surface reflection. The results of the analysis show thefeasibility of this proposal to upgrade the 2D to 3D radars

2). التي تستخدم هوائيين متماثلين D) يتضمن هذا البحث استثمار الرادارات الثنائية الأبعادللاستلام بتطويرها لتكون ثلاثية الأبعاد لغرض قياس ارتفاع الأهداف إضافة إلى قياس مدىالهدف المائل وزاوية الاتجاه الأفقية. قياس الارتفاع مهم لتامين المعلومات الأولية لغرض تقليلتم اختيارها لبناء وحدة (SDR) الزمن أللازم لمتابعة الهدف. تقنية البرامجيات المعرفة راديويامعالج إيجاد الارتفاع. المخطط الكتلي لوحدة معالج إيجاد الارتفاع المقترحة تم تضمينه في هذا.(SDR) البحث. القيم التصميمية لوحدة إيجاد الارتفاع تم اختيارها بما يتلاءم مع متطلبات تقنيةكذلك يتضمن هذا البحث تحليل للعوامل المؤثرة في إيجاد الارتفاع. هذه العوامل تتضمنالانكسار ومعامل الانعكاس من السطوح الملساء والانفراج ومعامل الانعكاس من السطوحالخشنة. نتائج التحليل بينت معقولية تطوير الرادارات الثنائية إلى رادارات ثلاثية.


Article
A Multiband Printed Slot Antenna Loaded with Trapezoidal Slots for WLAN and WiMax Applications

Author: H.T. Ziboon
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 1 Part (A) Engineering Pages: 55-59
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this paper, a multiband printed antenna has been proposed. The antenna structure is inspired from that of the classical multi-cavity magnetron resonator. The antenna structure is composed of a slot annular ring structure etched on the ground plane of a substrate. The outer circle of the annular ring is loaded with radially arranged small trapezoidal slots. While on the other side of the substrate, the antenna is fed with a 50-Ohm microstrip line. A parametric study has been conducted to explore the effect of the different antenna dimensions on its performance. The results show that the proposed antenna offers triple band resonant responses with considerable frequency ratios of f3/f2, and f2/f1. Measured results of the input reflection coefficient responses of a fabricated prototype are found to agree well with the theoretical findings. The antenna has an input reflection coefficient response enables it to serve the 2.4/5.2 GHz WLAN and the 3.5/4.5 GHz WiMax applications. Besides, the antenna offers reasonable radiation characteristic with acceptable values of the gain throughout the four resonant bands.


Article
Design and Simulation of Sigma-Delta Fractional-N Frequency Synthesizer for WiMAX
تصميم و محاكاة مركب التردد نوع (Sigma-Delta Fractional-N) لمنظومة WiMAX

Authors: H. T. Ziboon --- H.M. Azawi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 9 Pages: 1081-1096
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper presents a design and simulation of proposed frequency synthesizer whichcan be used for WiMAX. Design parameters for the proposed fractional-N PLLsynthesizer for WiMAX system are either selected from WiMAX standards oraccording to results of analysis for each unit of the proposed system. Differenttechniques for phase noise reduction are discussed. Sigma-delta fractional-Ntechnique is chosen for WiMAX system, since low settling time, spurious level andphase noise can be obtained by using this technique. The simulation result shows thesystem is stable, since the phase margin is greater than 45 degree. The settling time,spurious level and phase noise obtained with this synthesizer are 5.9μs, -90dBc/Hz,and -100dBc/Hz respectively. CppSim program (C++ simulator language) and Matlab(V.7) are used for simulation of ΣΔ fractional-N PLL synthesizer.

إن متغيرات التصميم لم  ركَّب التردد .WiMAX يتضمن هذا البحث تصميم ومحاكاة مركب التردد مقترح لمنظومةتم إستنتاجها من نتائج التحليل التي اجريت لكل وحدة في المنظومة المقترحة أو من ماهو WiMAX الكسري لمنظومة(Sigma-Delta منشور. تم مناقشة عدة تقنيات لتخفيض ضوضاء الطور. تم اختيار تقنية مركب التردد من نوعوذلك لتأمينها ضوضاء منخفضة و حزمة عريضة ودقة تفريق بالتردد عالية . ،WiMAX لمنظومة Fractional-N)، 5.9μs النتائج التي تم الحصول عليها لمركب التردد لزمن الإستقرار ومستوى التردد الطيفي وضوضاء الطورهيCppSim(C++ simulator language) -100 على التوالي . تم أستخدام برنامج dBc/Hz ،-90 dBc/Hz.(sigma-delta (ΣΔ) fractional-N) في محاكاة مركب التردد من نوع Matlab (V. وبرنامج ( 7


Article
Design and Implementation of Adaptive Modulation Modem Based on Software Defined Radio(SDR) for WiMAX System
تصمیم وبناء مضمن وكاشف ذو سرعة إرسال ونوع تضمین متغیر باستخدام البرامجیات المعرفة رادیویاً

Authors: H. T. Ziboon --- Zeinah Tariq Naif
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2010 Volume: 28 Issue: 14 Pages: 4730-4749
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper presents design and implementation of adaptivemodulation modem for WiMAX system. (BPSK, QPSK, 8QAM, 16QAM,32QAM and 64QAM) are used in this work. Software Defined Radio(SDR)is used for implementing this modem. This work examines the benefits ofusing adaptive modulation in terms of probability of bit error and spectralefficiency. It specifically examines the performance enhancement madepossible by using linear prediction along with channel estimation inconjunction with adaptive modulation. Simulation results proved that theadaptive system performance with estimator and predictor is better thanother modulation alone. The simulation results for adaptive modulation incompared to each modulation technique alone show that for BER=10-3 with(fd=50Hz -200Hz)system the improvement occurs by decreasing S/N by 2-3dB. As for BER=10-4 with same Doppler frequency, the systemimprovement takes place by decreasing S/N by 1.3dB- 4dB. RecardingBER=10-5 with same Doppler frequency, the improvement is by decreasingS/N by 1.5dB-5 dB. Simulation results also show the flexibility of theadaptive system to operate with different level of modulation based onswitching of S/N. Matlab7.8(R2009a) used for simulation of adaptivemodulation system with AWGN and fading channel.


Article
Design and Simulation of Digital PLL Synchronizer for BPSK and QPSK Based on Software Defined Radio
تصميم و محاكاة حلقة قفل طور رقمي مزامن للمفاتيح المتغيرة الطور الثنائية والرباعية بالاعتمادعلى برمجيات التعريف الراديوية

Authors: A. A. Thabit --- H. T. Ziboon
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2009 Volume: 27 Issue: 10 Pages: 2008-2026
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper presents a design and simulation of digital PLL synchronizer, usingCostas loop based on SDR for high frequency communication systems. Designparameters are selected for each unit of the proposed systems in order toaccommodate SDR requirements. Different techniques for carrier recovery basedon SDR are discussed. PLL techniques is chosen for synchronization, since it isone of the most active synchronization techniques. BPSK and QPSKsynchronizers for coherent receivers have been designed and simulated based onSDR using both Costas loop and modified Costas loop. The simulation resultshows that these two systems are reliable in recovering the carrier phase andfrequency when significant frequency and phase are present. Simulation resultshows that the BPSK system has Pe =10-3 at Eb / No equal to 8.5 dB in thepresence of AWGN and has the ability to track frequency offset up to 1200Hzwith 2*10 -4 probability of bit error at Eb / No equal to 20 dB. This system cantrack phase offset 45 o with Pe =10-4 at Eb / No equal to 20 dB. For QPSK system,the probability of bit error 10-3 at Eb / No =9dBand has the ability to trackfrequency offset 300 Hz and phase offset=9 o with Pe =10-3 at Eb / No equal to20dB.


Article
DWA TECHNIQUE TO IMPROVE DAC OF SIGMA-DELTA FRACTIONAL-N FREQUENCY SYNTHESIZER FOR WIMAX

Authors: H. T. Ziboon --- H.M. Azzawi
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2009 Volume: 12 Issue: 2 Pages: 93-100
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

A first order of DWA (Data Weighted Averaging) algorithm with third order sigma-delta modulator is proposed for application in sigma-delta fractional-N frequency synthesizer for WiMAX. In addition, this paper discusses the impact of mismatch between Digital-to-Analog convertor (DAC) unit elements. The simulation results show the effectiveness of the DWA technique in reduction of spurs, also DWA technique proves its ability to solve DAC unit elements mismatch. The fractional spur noise is converted into a broadband. Quantization noise with DWA is improved by – 10 dB if the element mismatch 0.01 and – 5 dB if the element mismatch 0.08 with 8 bit PFD/DAC. Matlab (V.7) program is used for simulation.

يتضمن هذه البحث مقترح لأستخدام خوارزمية (DWA)من الدرجة الاولى مع مضمن (Sigma-delta)من الدرجة الثالثة لتحسين أداء مركب التردد من نوع (Sigma-Delta Fractional-N) لمنظومةWiMAX .إضافة إلى ذلك تم مناقشة مشكلة عدم التوليف بين عناصر محول الاشارة الرقمية الى الكمية (DAC). نتائج المحاكاة بينت فعالية تقنية DWA في تقليل مستوى التردد الطيفي وكذلك التغلب على مشكلة عدم التوليف بين عناصر (DAC). مستوى الضوضاء الكسرية تم تحويلة الى الحزمة العريضة. تم تحسين الضوضاء الكمية بمقدار( dB 10-) عندما تكون قيمة عدم التوليف (0.01) و مقدار (-5dB) عندما يكون قيمة عدم التوليف (0.08) . تم استخدام برنامج Matlab (V.7) في محاكاة.


Article
Analysis and Theoretical Evaluation of Iraqi High Voltage Power Transmission Line

Authors: H. T. Ziboon --- A. A. Salman
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2018 Volume: 18 Issue: 2 Pages: 63-76
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The Powerline Communications (PLC) technology allows datatransmission through electrical wires. Thus the electrical wiring will representa data transmission channel conformable to the physical layer of the opensystem interconnection (OSI) model. In this work, the specifications of the Iraqielectrical network were used to model a high-voltage transmission line using atransmission (ABCD) matrix and use it as a communication channel fortransmitting data within a narrow band (30-500). The transfer function of thesuggested model was derived and its performance analysis was performed toevaluate the Line length effect, load impedance ZL and the source impedance ZSon the channel frequency response. This analysis was done with the help ofMatlab16a simulator program.

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